Question

試圖從PHP

$conn = mysqli_connect($servername, $username, $password, $dbname); 

// Find status for row with Username of the Url?username= 
$sql = "SELECT Status FROM Users WHERE Username = '".$_GET["username"]."'"; 
$result = mysql_query($sql) or die('Error connecting to database'); 
$username = mysql_result($result, 0, "Status"); 

echo 'Username Status is ' . $Status; 
mysqli_close($conn); 


?> 

在結果我得到讀取我的MySQL數據庫中的用戶的狀態讀取我的MySQL DATABSE用戶的狀態是這樣的：

Fatal error: Uncaught Error: Call to undefined function mysql_query() in /storage/ssd4/269/2113269/public_html/teststat.php:11 Stack trace: #0 {main} thrown in /storage/ssd4/269/2113269/public_html/teststat.php on line 11

Answer 1

你的語法mysqli是不正確的，因爲mysqli不同於mysql語法。

MySQLi代表MySQL改進。它是一個面向對象的接口，可以讓MySQL的綁定更容易使用。

我建議你使用的mysqli版本，並沒有查詢股價的MySQL語法與mysqli的語法。

$servername = "localhost"; 
$username = "username"; 
$password = "password"; 
$dbname = "myDB"; 

// Create connection 
$conn = new mysqli($servername, $username, $password, $dbname); 
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 

$sql = "SELECT Status FROM Users WHERE Username = '".$_GET["username"]."'"; 
$result = $conn->query($sql); 

if ($result->num_rows > 0) { 
    // output data of each row or remove while loop if you wish 
    while($row = $result->fetch_assoc()) { 
     echo 'Username Status is ' . $row['Status'] ; 
    } 
} else { 
    echo "0 results"; 
} 
$conn->close(); 

Answer 2

你混了mysql和mysqli的

$result = mysql_query($sql) or die('Error connecting to database'); 
$username = mysql_result($result, 0, "Status");